Question

Spring balance is used for measuring _______________
A. The force acting on the object
B. The force of friction
C. Magnitude of pressure
D. Relative motion between the objects

Answer 1

Hint – To solve this question firstly we should know about the principle and working of Spring balance and the concept behind it. We will also learn about Hooke's Law. Then with the help of our knowledge and the collected information we will be approaching the answer to our question.

Step-By-Step answer:
Spring balance is a mechanical device used for measuring the weight or force of an object by opposing the force of gravity with the force of an extended spring.
The principle behind its working is the principle of Hooke's law.

Hooke's law – The elongation of a spring is directly proportional to the load supported by the spring. Thus, scale marking on the spring is equally spaced.
F= k.x
Where;
F= load attach
k= spring constant
x= elongation of spring
The deformation of the spring and the load attach would be doubled with the doubling of any weight hanging on it.
Spring has contained steel pins and its upper end attaches to the support where lower end hooks with objects can hang on it.
So, spring balance is used to measure the force acting on the object.

Hence; the correct option is A – The force acting on the object.

Note - Spring balance measures the weight of an object but not used for mass. It is mainly used in industry where it is used to weigh the heavy loads such as trucks, conveyor belts etc. The principle behind its working is the principle of Hooke's law. Spring balance comes in different sizes, the smallest measure smaller spring constant therefore, larger measure the tens, hundreds, thousand.